Notes:The 1925 Stone Mountain
Commemorative Half Dollar is very common and is often found in nice
condition. The most frequently seen Uncirculated grade is MS-64,
but even MS-65 examples are common. The
finest Uncirculated examples graded by PCGS are
6 MS-68's.Walter Breen reported one matte Proof, whereabouts unknown.

A rare, doubled die
obverse exists...check the date, where the doubling is most likely
to be seen.

Some examples were
counterstamped with a state abbreviation and a number. These
are scarce and command a significant premium, which also means you
must watch out for fake counterstamps.